Overview

I am a Lecturer in Computational Mechanics in the College of Engineering, Mathematics and Physical Sciences. I studied civil engineering in the Aristotle University of Thessaloniki (Greece) where I also obtained my PhD. I continued my research as a post-doctoral researcher in the University of Luxembourg, while prior to joining the University of Exeter, I worked as a post-doctoral researcher in the group of Structural Mechanics and Monitoring at ETH Zurich (Switzerland), as part of a Marie Curie Individual Fellowship.

My research focuses on the development of methods for the computational modeling of fracture, and more recently on the combination of such methods with data-driven techniques towards the realization of the concept of "digital twins". Some specific topics of interest include the modeling of non-planar crack propagation using enriched finite element methods, the development of reduced order models for cracked solids and structures, as well as their application to crack detection problems.

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Publications

_{Copyright Notice: Any articles made available for download are for personal use only. Any other use requires prior permission of the author and the copyright holder.}

| 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2011 |

2024

• Agathos K, Vlachas K, Garland A, Chatzi E. (2024) Accelerating structural dynamics simulations with localised phenomena through matrix compression and projection‐based model order reduction, International Journal for Numerical Methods in Engineering, DOI:10.1002/nme.7445.

2023

• Battu RS, Agathos K, Papatheou E. (2023) Enhancing Structural Health Monitoring with Machine Learning and Data Surrogates: A TCA-Based Approach for Damage Detection and Localisation, Structural Health Monitoring 2023: Designing SHM for Sustainability, Maintainability, and Reliability - Proceedings of the 14th International Workshop on Structural Health Monitoring, pages 2854-2861.
• BATTU RS, AGATHOS K, PAPATHEOU E. (2023) ENHANCING STRUCTURAL HEALTH MONITORING WITH MACHINE LEARNING AND DATA SURROGATES: A TCA-BASED APPROACH FOR DAMAGE DETECTION AND LOCALISATION, Proceedings of the 14th International Workshop on Structural Health Monitoring, DOI:10.12783/shm2023/37060.
• PAPATHEOU E, TATSIS K, AGATHOS K, HAYWOOD-ALEXANDER M, DERVILIS N, WORDEN K. (2023) ON THE USE OF MODEL-BASED VERSUS DATA-BASED APPROACHES FOR VIRTUAL SENSING IN SHM, Proceedings of the 14th International Workshop on Structural Health Monitoring, DOI:10.12783/shm2023/37061.
• Reyes SI, Vassiliou MF, Agathos K, Konstantinidis D. (2023) FINITE ELEMENT MODELING OF THE ROLLING BEHAVIOR OF A POLYURETHANE SPHERE FOR LOW-COST SEISMIC ISOLATION APPLICATIONS, COMPDYN Proceedings.
• Nicoli S, Agathos K, Kudela P, Chatzi E. (2023) A Moment-Fitted Extended Spectral Cell Method for Structural Health Monitoring Applications, Applied Sciences, volume 13, no. 18, pages 10367-10367, DOI:10.3390/app131810367. [PDF]
• Sieber P, Agathos K, Soman R, Ostachowicz W, Chatzi E. (2023) Guided waves-based SHM using an ML-based parametric ROM, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII, Proceedings of SPIE--the International Society for Optical Engineering, volume 12487, DOI:10.1117/12.2658304.

2022

• Sharma JK, Fiborek P, Soman R, Kudela P, Agathos K, Chatzi E, Ostachowicz W. (2022) DEEP LEARNING BASED SURROGATE MODELLING OF WAVE PROPAGATION AND DAMAGE DETECTION IN CRACKED ROD, WCCM-APCOM 2022 - 15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics.
• Battu RS, Agathos K, Smith C, Papatheou E. (2022) Robust training databases for supervised learning algorithms in structural health monitoring applications, International Conference on Noise and Vibration Engineering-ISMA2022, Ku Leuven, Leuven, Belgium, 12th - 14th Sep 2022.
• Tatsis KE, Agathos K, Dertimanis VK, Chatzi EN. (2022) A Hierarchical Filtering Approach for Online Damage Detection Using Parametric Reduced-Order Models, Special Topics in Structural Dynamics & Experimental Techniques, Volume 5, Springer Nature, 103-105, DOI:10.1007/978-3-031-05405-1_14.
• Sharma J, Fiborek P, Soman R, Kudela P, Agathos K, Chatzi E, Ostachowicz W. (2022) Damage detection in isotropic cracked rod via fusion of genetic algorithm with deep learning-based wave propagation simulators, 15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII), DOI:10.23967/wccm-apcom.2022.034.
• Nicoli S, Agathos K, Chatzi E. (2022) Moment fitted cut spectral elements for explicit analysis of guided wave propagation, Computer Methods in Applied Mechanics and Engineering, volume 398, pages 115140-115140, article no. 115140, DOI:10.1016/j.cma.2022.115140. [PDF]
• Agathos K, Dodwell T, Chatzi E, Bordas SPA. (2022) An adapted deflated conjugate gradient solver for robust extended/generalised finite element solutions of large scale, 3D crack propagation problems, Computer Methods in Applied Mechanics and Engineering, volume 395, DOI:10.1016/j.cma.2022.114937.
• Tatsis KE, Agathos K, Chatzi EN, Dertimanis VK. (2022) A hierarchical output-only Bayesian approach for online vibration-based crack detection using parametric reduced-order models, Mechanical Systems and Signal Processing, volume 167, DOI:10.1016/j.ymssp.2021.108558.
• Vlachas K, Tatsis K, Agathos K, Brink AR, Quinn D, Chatzi E. (2022) On the Coupling of Reduced Order Modeling with Substructuring of Structural Systems with Component Nonlinearities, Conference Proceedings of the Society for Experimental Mechanics Series, pages 35-43, DOI:10.1007/978-3-030-75910-0_4.

2021

• Sieber P, Agathos K, Soman R, Ostachowicz W, Chatzi E. (2021) A Parametrized Reduced Order Model for Rapid Evaluation of Flaws in Guided Wave Testing, Structural Health Monitoring 2021: Enabling Next-Generation SHM for Cyber-Physical Systems - Proceedings of the 13th International Workshop on Structural Health Monitoring, IWSHM 2021, pages 679-686.
• Nicoli S, Agathos K, Kudela P, Ostachowicz W, Chatzi E. (2021) Comparison of Plate and Solid Spectral Element Modeling of Composite Delamination for Guided Wave Simulations, Structural Health Monitoring 2021: Enabling Next-Generation SHM for Cyber-Physical Systems - Proceedings of the 13th International Workshop on Structural Health Monitoring, IWSHM 2021, pages 687-694.
• Konstantinos V, Tatsis K, Agathos K, Brink A, Quinn D, Chatzi E. (2021) Reduced Order Modeling for systems with component nonlinearities, Proposed for presentation at the 8th International Conference on Computational Mehtods in Structural Dynamics and Earthquake Engineering, DOI:10.2172/1869144.
• Vlachas K, Tatsis K, Agathos K, Brink AR, Quinn D, Chatzi E. (2021) Parametric Model Order Reduction for Localized Nonlinear Feature Inclusion, Advances in Nonlinear Dynamics, Springer Nature, 373-383, DOI:10.1007/978-3-030-81162-4_33.
• Nicoli S, Agathos K, Chatzi E. (2021) Moment fitted cut spectral elements for explicit analysis of guided wave propagation, DOI:10.48550/arxiv.2108.04178.
• Agathos K, Dodwell T, Chatzi E, Bordas SPA. (2021) An adapted deflated conjugate gradient solver for robust extended/generalised finite element solutions of large scale, 3D crack propagation problems. [PDF]
• Agathos K, Tatsis KE, Vlachas K, Chatzi E. (2021) Parametric reduced order models for output-only vibration-based crack detection in shell structures, Mechanical Systems and Signal Processing, volume 162, DOI:10.1016/j.ymssp.2021.108051.
• Vlachas K, Tatsis K, Agathos K, Brink AR, Chatzi E. (2021) A local basis approximation approach for nonlinear parametric model order reduction, Journal of Sound and Vibration, volume 502, pages 116055-116055, article no. 116055, DOI:10.1016/j.jsv.2021.116055. [PDF]
• Agathos K, Tatsis K, Nicoli S, Bordas SPA, Chatzi E. (2021) Crack detection in Mindlin-Reissner plates under dynamic loads based on fusion of data and models, Computers and Structures, volume 246, DOI:10.1016/j.compstruc.2020.106475.

2020

• Vlachas K, Tatsis K, Agathos K, Brink AR, Chatzi E. (2020) A local basis approximation approach for nonlinear parametric model order reduction, DOI:10.48550/arxiv.2003.07716.
• Jacquemin T, Tomar S, Agathos K, Mohseni-Mofidi S, Bordas SPA. (2020) Taylor-series expansion based numerical methods: a primer, performance benchmarking and new approaches for problems with non-smooth solutions, DOI:10.48550/arxiv.2009.11953.
• Vlachas K, Tatsis K, Agathos K, Brink AR, Chatzi E. (2020) A physics-based, local POD basis approach for multi-parametric reduced order models, Proceedings of ISMA 2020 - International Conference on Noise and Vibration Engineering and USD 2020 - International Conference on Uncertainty in Structural Dynamics, pages 1925-1936.
• Agathos K, Bordas SPA, Chatzi E. (2020) Parametrized reduced order modeling for cracked solids, International Journal for Numerical Methods in Engineering, volume 121, no. 20, pages 4537-4565, DOI:10.1002/nme.6447. [PDF]

2019

• Egger A, Pillai U, Agathos K, Kakouris E, Chatzi E, Aschroft IA, Triantafyllou SP. (2019) Discrete and Phase Field Methods for Linear Elastic Fracture Mechanics: A Comparative Study and State-of-the-Art Review, Applied Sciences, volume 9, no. 12, pages 2436-2436, DOI:10.3390/app9122436. [PDF]
• Jacquemin T, Tomar S, Agathos K, Mohseni-Mofidi S, Bordas SPA. (2019) Taylor-Series Expansion Based Numerical Methods: A Primer, Performance Benchmarking and New Approaches for Problems with Non-smooth Solutions, Archives of Computational Methods in Engineering, volume 27, no. 5, pages 1465-1513, DOI:10.1007/s11831-019-09357-5. [PDF]
• Agathos K, Chatzi E, Bordas SPA. (2019) A unified enrichment approach addressing blending and conditioning issues in enriched finite elements, Computer Methods in Applied Mechanics and Engineering, volume 349, pages 673-700, DOI:10.1016/j.cma.2019.02.005. [PDF]
• Agathos K, Bordas SPA, Chatzi E. (2019) Improving the conditioning of XFEM/GFEM for fracture mechanics problems through enrichment quasi-orthogonalization, Computer Methods in Applied Mechanics and Engineering, volume 346, pages 1051-1073, DOI:10.1016/j.cma.2018.08.007. [PDF]

2018

• Agathos K, Chatzi E, Bordas SPA. (2018) Multiple crack detection in 3D using a stable XFEM and global optimization, Computational Mechanics, volume 62, no. 4, pages 835-852, DOI:10.1007/s00466-017-1532-y. [PDF]
• Agathos K, Ventura G, Chatzi E, Bordas SPA. (2018) Well Conditioned Extended Finite Elements and Vector Level Sets for Three-Dimensional Crack Propagation, Lecture Notes in Computational Science and Engineering, Springer International Publishing, 307-329, DOI:10.1007/978-3-319-71431-8_10. [PDF]

2017

• Agathos K, Ventura G, Chatzi E, Bordas SPA. (2017) Stable 3D XFEM/vector level sets for non‐planar 3D crack propagation and comparison of enrichment schemes, International Journal for Numerical Methods in Engineering, volume 113, no. 2, pages 252-276, DOI:10.1002/nme.5611. [PDF]

2016

• Agathos K, Chatzi E, Bordas S. (2016) 3D Crack Detection Using an XFEM Variant and Global Optimization Algorithms, Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures, DOI:10.21012/fc9.261.
• Agathos K, Chatzi E, Bordas SPA. (2016) Stable 3D extended finite elements with higher order enrichment for accurate non planar fracture, Computer Methods in Applied Mechanics and Engineering, volume 306, pages 19-46, DOI:10.1016/j.cma.2016.03.023. [PDF]

2015

• Agathos K, Chatzi E, Bordas SPA, Talaslidis D. (2015) A well‐conditioned and optimally convergent XFEM for 3D linear elastic fracture, International Journal for Numerical Methods in Engineering, volume 105, no. 9, pages 643-677, DOI:10.1002/nme.4982. [PDF]

2011

• Castro R, Agathos K, Talaslidis D. (2011) A consistent approach to mass matrix lumping in dynamic finite element analysis of flat shells, Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011, pages 3589-3594.

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